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In order to avoid the wrong caller package issue, you can create a wrapping sub for open in the caller package and jump there using goto &$sub which overwrites the current stack frame. Something similar to the following code:
package MyOpen; use Carp (); use Data::Dumper; use 5.010; my %cache; BEGIN { *CORE::GLOBAL::open = sub { my $pkg = caller; my $sub = $cache{$pkg} //= do { my $code = <<EOS; package $pkg; sub { my \$r = CORE::open \$_[0], \@_[1..\$#_]; Carp::cluck(Data::Dumper::Dumper(\@_)); return \$r; } EOS eval $code or die "Bad sub: $@"; }; goto &$sub; }; } package main; open $fh, '>&', 'STDOUT'; open FOO, ">", "/tmp/FOO";

In reply to Re^5: Track open file handles by salva
in thread Track open file handles by shmem

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